A360395 - OEIS

A360395

Intersection of A026430 and A360394.

1, 6, 9, 15, 19, 24, 27, 31, 36, 42, 45, 51, 55, 60, 66, 69, 73, 78, 81, 87, 91, 96, 99, 103, 108, 114, 117, 121, 126, 129, 135, 139, 144, 150, 153, 159, 163, 168, 171, 175, 180, 186, 189, 195, 199, 204, 210, 213, 217, 222, 225, 231, 235, 240, 246, 249, 255

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OFFSET

1,2

COMMENTS

This is the second of four sequences that partition the positive integers. Starting with a general overview, suppose that u = (u(n)) and v = (v(n)) are increasing sequences of positive integers. Let u' and v' be their complements, and assume that the following four sequences are infinite:

(1) u ^ v = intersection of u and v (in increasing order);

(2) u ^ v';

(3) u' ^ v;

(4) u' ^ v'.

Every positive integer is in exactly one of the four sequences. The limiting densities of these four sequences are 4/9, 2/9, 2/9, and 1/9, respectively.

For A360395, u, v, u', v', are sequences obtained from the Thue-Morse sequence, A026430, as follows:

u = A026530 = (1,3,5,6,8,9,10, 12, ... ) = partial sums of A026430

u' = A356133 = (2,4,7,11,13,17, 20, ... ) = complement of u

v = u + 1 = A285954, except its initial 1

v' = complement of v.

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

(1) u ^ v = (3, 5, 8, 10, 12, 14, 16, 18, 21, 23, 26, 28, 30, 33, ...) = A360394

(2) u ^ v' = (1, 6, 9, 15, 19, 24, 27, 31, 36, 42, 45, 51, 55, 60, ...) = A360395

(3) u' ^ v = (7, 11, 17, 20, 25, 29, 32, 38, 43, 47, 53, 56, 62, ...) = A360396

(4) u' ^ v' = (2, 4, 13, 22, 34, 40, 49, 58, 64, 76, 85, 94, 106, ...) = A360397